3 Questions
Which of the following is NOT a characteristic of a chemical reaction?
Release of energy
Which of the following is an example of a chemical reaction?
Burning of wood
What is the difference between a chemical reaction and a physical change?
Chemical reactions involve a change in composition, while physical changes involve a change in state.
Study Notes
Chemical Reactions
- A characteristic of a chemical reaction is a change in the chemical composition of the substances involved, resulting in new substances with new properties.
- A characteristic of a chemical reaction is the absorption or release of energy, often in the form of heat or light.
- A characteristic of a chemical reaction is the formation of new bonds between atoms or molecules.
Non-Characteristics of Chemical Reactions
- A change in state (e.g., solid to liquid or liquid to gas) is not a characteristic of a chemical reaction, but rather a physical change.
Examples of Chemical Reactions
- Rusting of iron is an example of a chemical reaction, where iron reacts with oxygen to form iron oxide.
- Combustion reactions, such as burning gasoline in a car engine, are examples of chemical reactions.
Chemical Reactions vs. Physical Changes
- A chemical reaction involves a change in the chemical composition of the substances involved, whereas a physical change involves a change in the state of a substance, but not its chemical composition.
- Examples of physical changes include melting, freezing, condensation, and evaporation.
Test your knowledge on chemical reactions and equations with this quiz! Identify the characteristics of chemical reactions, distinguish between chemical reactions and physical changes, and identify examples of chemical reactions.
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